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Lithium ferric manganese phosphate as cathode material of nanometer fibrous lithium ion battery and preparation method of lithium ferric manganese phosphate

A lithium-ion battery, lithium iron manganese phosphate technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low discharge voltage platform, poor rate performance and specific capacity density, poor cycle performance of lithium manganese phosphate materials, etc. Achieve the effect of low cost and simple process

Active Publication Date: 2012-10-03
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to use a new type of nanofibrous lithium iron manganese phosphate as the positive electrode material of lithium ion battery to overcome the low discharge voltage platform of lithium iron phosphate material in the existing lithium ion positive electrode material and the cycle performance of lithium manganese phosphate material Poor, and the technical defect that the structure of the existing lithium iron manganese phosphate material is easy to collapse, so as to solve the problems of the existing lithium-ion battery cathode materials in terms of rate performance and poor specific capacity density

Method used

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  • Lithium ferric manganese phosphate as cathode material of nanometer fibrous lithium ion battery and preparation method of lithium ferric manganese phosphate
  • Lithium ferric manganese phosphate as cathode material of nanometer fibrous lithium ion battery and preparation method of lithium ferric manganese phosphate
  • Lithium ferric manganese phosphate as cathode material of nanometer fibrous lithium ion battery and preparation method of lithium ferric manganese phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0026] At a temperature of 20°C and a humidity of 50%, weigh 0.9g of polyvinylidene fluoride and dissolve it in 3mL of acetone and 7mL of a volatile solvent, then add 0.179g of ferrous acetate (Fe(Ac) 2 ), 0.115g of 85wt% phosphoric acid (H 3 PO 4 ) and 0.068g of lithium acetate (LiAc), evenly dispersed and put into the shell syringe; Weigh 0.8g of polyvinylidene fluoride and dissolve in 3mL of acetone and 7mL of volatile solvent, then add 0.245g of manganese acetate tetrahydrate (Mn(Ac) 2 4H 2 O), 0.115g of 85wt% phosphoric acid (H 3 PO 4 ) and 0.068g of Lithium Acetate (LiAc), evenly dispersed into the core syringe; the above-mentioned volatile solvents are ethanol, acetone, chloroform, dichloromethane, N, N-dimethylformamide or N-methyl One or more of pyrrolidone; the electric field intensity is controlled at 0.8KV / cm, the advancing speed of the shell injector is 0.15mL / h, and the advancing speed of the core injector is 0.05mL / h for electrospinning (see figure 1 ); af...

Embodiment 2

[0030] In an environment with a temperature of 25°C and a humidity of 20%, weigh 1.8g of polyacrylonitrile and dissolve it in 20mL of N,N-dimethylformamide, then add 0.160g of ferric oxide (Fe 2 o 3), 0.231g of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and 0.079g of lithium carbonate (Li 2 CO 3 ), and put it into a shell syringe after dispersing evenly; weigh 1.7g of polyvinylidene fluoride and dissolve it in 20mL of N,N-dimethylformamide, and then add 0.490g of manganese acetate tetrahydrate (Mn(Ac) 2 4H 2 O), 0.231g of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and 0.079g of lithium carbonate (Li 2 CO 3 ), dispersed evenly and put into the core injector; the electric field intensity was controlled at 1.0KV / cm, the advancing speed of the shell injector was 0.18mL / h, and the advancing speed of the core injector was 0.07mL / h for electrospinning; After the electrospinning product was dried, it was reacted in a nitrogen atmosphere at 650°C for 8 hours, and the...

Embodiment 3

[0032] In an environment with a temperature of 20°C and a humidity of 70%, weigh 2.7g of polyvinylpyrrolidone and dissolve it in 30mL of ethanol solvent, then add 0.699g of ferric oxalate pentahydrate (Fe 2 (C 2 o 4 ) 3 ·5H 2 O), 0.396g of diammonium hydrogen phosphate ((NH 3 ) 2 HPO 4 ) and 0.072g of lithium hydroxide (LiOH), evenly dispersed and put into the shell syringe; Weigh 2.7g of polyvinylpyrrolidone and dissolve it in 30mL of ethanol, then add 0.735g of manganese acetate tetrahydrate (Mn(Ac) 2 4H 2 O), 0.398g of diammonium hydrogen phosphate ((NH 3 ) 2 HPO 4 ) and 0.072g of Lithium Hydroxide (LiOH), evenly dispersed and put into the core injector; the electric field intensity is controlled at 1.8KV / cm, the advancing speed of the shell injector is 0.21mL / h, and the advancing speed of the core injector is 0.07 mL / h for electrospinning (see equipment schematic diagram figure 1 ); dry the obtained electrospinning product and react it in a nitrogen atmosphere a...

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Abstract

The invention relates to lithium ferric manganese phosphate as a cathode material of a novel nanometer fibrous lithium ion battery. The lithium ferric manganese phosphate is prepared according to the following steps that iron source compounds, manganese source compounds, phosphorus source compounds, lithium source compounds and macromolecular polymers are used as raw materials, the manganese source compounds easily eroded by electrolyte are dispersed in core layer solution, the more stable iron source compounds are dispersed in case layer solution, and an electrostatic spinning method is adopted. The method for preparing composite materials has the advantages that on one hand, a voltage platform of lithium ion positive electrode materials can be improved, and the specific capacity density and the specific power density of the materials can be greatly improved; and on the other hand, because manganese elements are wrapped in a material core layer, the defects that in the existing preparation technology of the cathode material of the manganese-element-containing lithium ion battery, manganese elements are easily dissolved by electrolyte, the structure is not stable enough, the collapse is easily caused, and the volume attenuation is caused are overcome, and meanwhile, because of the nanometer fiber morphology character, the specific capacity and specific power density and the multiplying power circulation performance of the materials are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and in particular relates to a novel nanofibrous lithium ion battery cathode material, lithium iron manganese phosphate and a preparation method thereof. Background technique [0002] In 1934, Formhals (Formhals, A. Process and apparatus for preparing artificial threads. US patent, 197504, 1934) applied for a patent and invented a device for generating high-molecular polymer ultrafine fibers by static electricity. In 1966, Simons (Simons, H.L. Process and apparatus for producing patterned nonwoven fabrics. US Patent. 3280229, 1966) applied for a patent for preparing ultra-thin non-woven fabrics by electrospinning. In 1999, Fong (Fong, H. Chun, I. et al. Polymer, 1999, 40:4585) studied the key factors affecting the formation of bead filaments. In 2011, Wang HY et al. (Wang, HY. Wu, DY. et al. Nanoscale, 2011, 3: 3601) applied electrospinning technology to the p...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 张卫东周恒辉汪晓雅陈继涛
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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